* {
    box-sizing: border-box
}

body {
    font-family: Arial, sans-serif;
    background: #eee;
    margin: 0
}

main {
    max-width: 1100px;
    margin: 25px auto;
    background: white
}

h1 {
    text-align: center;
    background: #222;
    color: white;
    margin: 0;
    padding: 28px
}

.hero {
    height: 340px;
    background: url('../Images/phonebgrd.jpg') center/cover;
    display: flex;
    align-items: center;
    justify-content: center
}

.hero span {
    font-size: 46px;
    color: #f5ff55;
    text-shadow: 2px 2px 3px #333
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    padding: 30px
}

.features article {
    padding: 18px;
    border: 1px solid #ddd;
    box-shadow: 0 3px 10px #0001
}

footer {
    text-align: center;
    background: #22aa44;
    color: white;
    padding: 30px
}

button {
    padding: 12px 28px
}

@media(max-width:700px) {
    .features {
        grid-template-columns: 1fr
    }

    .hero span {
        font-size: 30px;
        text-align: center
    }
}